Vertical-cylinder grinder



Feb. 27, 1923. y 1,447,152v

E. RIVETT- VERTICAL CYLINDER GRINDER Filed Jan. 24, l9l9 5 sheets-sheet l j? Figi.

lnvenror, Edward Fiver ww smgfrm Any's.

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Feb. 27, 1923.

E. RlVETT VERTICAL CYLINDER GRINDER 5 sheets-sheet 5 Filed Jan. 24, 1919 Fig. 6.

Invenor. I Edward Five by fmmwm AT ry's.

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@WARD M'VETT, Oli' HULL, MASSACHUSETTS.

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Application filed January 24, 1919.l Seal No. 272,@3?,

To all whom t 'may concer/n.'

Be it known that l, EDWAnn ltivn'rr, a citizen of the United States, residing at Hull, county of Plymouth, State of Massachusetts, have invented an improvement in VerticalfCylinder Grinders, of which Vthe following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates -to grinding machines or to any other machines for doing similar work such as abrading, polishing or bung, and the object of the invention is to provide a vertical cylinder machine of this class, thatis, a machine employing a tool on a 'vertical spindle mounted'eccentrically in, or out oi' alinement with the axis of, a carrier having a vertical and rotary movement to carry the tool over a cylindrical surface such as the interior of an engine cylinder.

The invention has for its object to provide a Amachine of this character in which the carrier for the tool shall have the parts carried thereby so located; and arranged that'they shall be balanced with respect to the axis of rotation thus insuring ease of movement and accuracy of the work.

The invention has for its further object to provide for mounting the actuating inotor for rotating the tool directly' upon the vertically movable and rotary carrier and preferably for transmitting rotary movement to the tool spindle from this motor through an endless belt.. so arranged as to give a balanced pull upon the tool spindle. 4The invention has for its further object to provide inea-ns preferably governed by the number of rotations of the carrier for progressively fee-ding the tool radially against the work and preferably also for simultaneously feeding a counterbalance in the opposite direction.

rThe invention has for its further object to provide a machine of this character in which the tool may be runat very high speed while carried over the surface of the work and fed thereto at such a rate as will secure the most effective action on the Work.

The invent-ion presents a maehine' in which the parts are compactly arranged, one in which the construction is of simple and efiicient design, 'one in which the wear of the parts is reduced to the minimum, and

- .one in which accuracy of the operation is assured.

v These andA other features of the invention i will appear more fully 'from the accompanying `description and drawings and will be particularly ,pointed ont in the claims.

The invention is more particularly adapted for grinding the interior of cylinders where extreme accuracy is essential and a machine designed for that Vpurpose is theretore illustrated and described as the preferred form of the invention, but it is to be understood that the invention in its broader aspect is not to be restricted other than as deined by the claims.

In the drawings, Y

Figure l is a'view in side elevation partially' broken away and with some of the parts removed of a construction of vertical grinder embodying. the invention; j

Fig. 2 is a' view in front elevation partially in vertical cross section of the main portion of the vertical grinder shown in Fig. 1; i

Fig. 3 is a detail on alarger scale in vertical cross section of a portion of the carrier showing the drive for the grinder spindle;

Fig. 4 is a detail on the same scale as Fig.

. 3 in vertical section taken at right angles to Fig. 3;

Fig. 5 is a view in side elevation and partially in vertical cross section of a portion of the vertical grinder showing the means for centering the Work with respect to the grinder;

'Fig'. 6 is a .view in horizontal cross section Jtaken on the line 6-6, Fig. 4;

Fig. 7 is a side elevation of the carrier base showing themeans for feeding the grinder spindle radially of the carrier;

Fig. 8 a View in rear elevation of the means adaptedto be detachably secured to the carrier for centering the work with respect to the grinder.

The machine of this invention is primarily designed for grinding the interior periphery Aof cylindrical articles such -as engine cyllos to permit the work supported on the bed plate to project into or hang in the hollow interior of the bed. In the drawings a piece of work is illustrated as a gasolene engine cylinder 3. Such apiece .of work may be conveniently supported in the bed by having its dange l secured by the bolts or screws 5 to a recessed plate 6 which plate is in turn secured by the clamping screws 7 to the bed plate 2 so that the work hangs in the hollowT interior of the bed. rlhe bolts or screws 7 pass through washers 8 and through holes in the plate 6 much larger than the shanks of the bolts or screws so that the work may be shifted about on the bed plate 2 before being clamped in place to center it beneath the grinder.

A head extends over or is mounted above the bed and may conveniently be formed as illustrated of a pair of vertical flanged side plates 9, 10 secured by screws 11 directly to the bed. lThese side plates are secured together at various points as required to provide a suitable support for the various pon tions of the mechanism. At or near the front a skeleton guide 11 extends horizontally be tween the plates and is secured thereby by screws l2.

At the top the plates are again shown as secured together by a top plate 13 provided with a depending cylindrical socket le which is vertically alined with a cylindrical socket 15 formed in the guide 11.

rlhe grinder 16 is carried by a carrier which is mounted for vertical and rotary movement in the head so that the 'grinder may move up and down over the surface of the work to be ground and may be carried in a circular direction around the surface of the work to be ground. ln the construe tion illustrated this carrier comprises a vertically arranged hollow shaft 17 iianged at .18 and having secured thereto a hollow rectangnlar carrier base 19 and a spindle supt 2O radially movable on the carrier base in which the grinder spindle is mounted. he carrier shaft 17 has a bearing lait in the cylindrical socket l5 of the guide ll and is 'n ed 2l in the hub 22 of a bevel gear which hub has a bearing lit in the cylin- :s 15, Ilie alleman carrier will be given a vertical movement in the head and that when the pulley 23 is driven the carrier will be given a rotary movement in the head.

Suitable means are provided for rockingl the bell crank lever to give the required vertical movement of the carrier. For that purpose a horizontal worm shaft 32 is shown journaled in a bracket 33 extending rearwardly from the side plate 10 of the head. rlhis shaft isdriven by a pulley 34C from any suitable source of power. The worm 35 of the shaft engages a worm wheel 36 on a shaft 37 extending horizontally between the side plates 9, and 10 ofthe head. This shaft 37 in turn carries a heart-shaped cam 38. A follower 39 rests upon the cam 38 and is pivoted on a vertical slide d0. rllhis slide is bifurcated and forked at its lower end to straddle the shaft 37 and at its upper end presents a rod sliding in a bracket l1 project-.ing rearwardl from the head. A pair of links 42 are pivoted at their lower ends onthe pivot i3 and at the upper ends to a collar 4l. This collar is adjustably secured at points along the arcuate arm 45 of the bell crank lever whose shorter arm has already been described. rlhe end of this lever is weighted to more than counterbalance the grinder, its carrier and parts supported thereby. lt ,will thus be seen 1that as the pulley 34 is driven the cam 33 is revolved and acting against the follower 39 rocks the bell crank lever on its fulcrum 31 thus vertically reciprocating the carrier.

rlhe grinder 16 is mounted upon the lower end of a tapered grinder spindle 46 which has bearings at its upper and lower ends in bushings 47 and i3 set'into a twopart vert-ical spindle casing The spindle at its lower end above the grinder is provided with an annular shoulder 51 and near its upper end is screnrthreatled 'and provid-ed with a nut wear takes place the shoulder ground and the nut maintain the spindle with an ning' litin the bushings. spindle easing` at its upper t into the spindle rh ended at which is mounted for a late morenas-.nt in the carrier threaded c i between easing removed ength and carrying a gn if or character to be s feeding movement. lt is very importantto accurate Work that the massof the revolving carrier and the parts supported by it shall be balanced with respect to the axis of rotation. Consequently, a counterbalance is provided for Ithe spindle support and lthe parts carried thereby and this counterbalance is so arranged that as the spindle support is fed in one direction the counterbalance is fed in the opposite direction. Such a counterbalance which may be of such sizeand Weight as necessary is indicated as a mass of metal 54 provided with guide pins 55 extendinof into guidevvays in the carrier base and With a hollow internally screwthreaded guide pin 56 extending into the spindle support 20. A reversely screwthreaded shaft 57 has one set of its screwthreads tting thel guide pin 56 and the other set a screw-threaded portion 58 ofthe spindle support While at one end it is jour-.

ly. As a simple and elicient means for securing this progressively radial feeding movement of the spindle support the Shaft 57 is shown as provided at its end Witha disk 6() having a plurality of removable and replaceable pins 6l. Adjacent on the plate 59 orn the carrier base is .pivotally mounted a ratchet Wheel 62 also provided with a plurality of removable and replaceable pins 63. The pins on 'the ratchet Wheel 62 and the pins on the disk contact after-the manner et gear teeth and by varying the number of pins the number of rotations given to the shaft 57 by rotation of the ratchet Wheel may be varied. rlhe ratchet Wheel is preferably rotatedi'by a paWl 64 and a paWl carrier 65 pivoted on the axis of the ratchet Wheel 62, limited as to its movement in one direction by the stud 66 and moved in the opposite direction by striking against a iin 67 on the side plate 10 of the head. Thus during each rotation of the carrier when ator near its upper limit of vertical movement the paWl carrier striking the iin moves the ratchet Wheel 62 a predetermined distance and consequently depending upon the number and position of the pins rotates the shaft 57 to move the spindle support a predetermined amount.

rllhe spindle support is ilanged at each side and these flanges rest upon roller bearings 68 in turn resting upon the bottom plate 69 of the carrier base. A roller bearing 7() is arranged above the flange of the spindle support at one side and a ball bearing 71 is arranged in a groove in the opposite flange of the spindle support and a groove in the carrier base. This employment of roller bearings and a single ball bearing insures the accurate movement of the spindle support rectilinearly and prevents any sidewise shifting which is essential to secure accurate Work.

The rotation of the grinder spindle and grinder With respect to the carrier is preferably secured in this invention by an endless belt drive extending down through the hollow carrier and actuated by an' actuating pulley at the top ot the carrier which actuating pulley in turn is preferably driven by a motor mounted directly upon the carrier. An electric motor may preferably be employed for this purpose and the endless belt drive may preferably be oi' thecharacter disclosed in my Patent 1,302,222 granted April 29, 1919.

As a preferred form o construction for thus rotating the grinder spindle and' grinder an electric motor 72 of suitable type is rigidly secured to the upper end of' the hollow carrier 17. and preferably has its pulley 7 3 mounted on a vertical axis in line with the axis of the carrier. Since this motor has a vertical and rotary movement with the carrier means are. provi-ded for transmitting the current to the motor under these conditions. ,As a simple means for this purpose the current supplying Wlres 74 and 75 of the circuit are shown as connected to uprights 76 and 77 mounted on the side plates 9 and 10 of the head. A

' carriage 7 8 formed or or containing insulat- Hence the current will be properly transmitted to the motor ynotWi-thstanding the bodily vertical and rotary movement of the motor with the carrier.

' The endless cord or belt l88 extends about the actuating pulley 73 down over a pair of idlers 89 and 90. rlhese idlers are pivoted in slotted brackets 91 secured by screws 92 to'vthe motor casing so that they may be adjusted in and out in a general radial direction to take up slack in the belt. From these idlers the endless belt extends down to another pair ofi idlers 93 and 9d mounted on brackets 95 sCured to the bottom ot the motor casing. Frein these idlers the belt extends radially into the center of the carrier and about idlers 96 mounted in the upper end oi2 the carrier *which serve to divert the belt down the bore of the carrier. fi. pair oi idlers 07 and 98 mounted in the carrier base serve to direct the two vertical runs ci the belt horizontally into the. carrier base and about double grooved idlers 931 and 100 mounted on vertical aires at opposits ends or the carrier base. The grinder spindle i6 at its upper end is provided with a double grooved puiley itil about which the endless belt extends and the arrangement is such that the strain oi the elt on the spindle is balanced so that there is no tendency by reason of the drive to bind the spindle its bearing. This result is secured by leading one run oi the endless belt 88, as 'for example the right hand run 3, down around the idler 98., thence around the upper groove in the idler i430, thence around the upper groove in the pulley 1.0ion the spindle., thence back around the lower groove of the idler 100, thence across to upper groove of the idler 99, thence around. the lower groove of the pnl ey 10i on the spindle, thence baclr around the lower groove of e idler e9, thence under the idler 9'@ and thence back up the hollow carrier shaft. Thum not only is the off the belt onV the spindle balanced but the drive provides for the lateral or ra dial shifting of the spindle to secure the proper eccentric adjustment and as it is fed up to and from the Werl: because it is iinmaterial t@ this arrange ent of drive just what position the spindle pulley 10i occupiesbetvveen the idlers 99 and 100.

TWith the electric motor mounted on the carrier and with the endless belt drive it -is possible to run the grinder at a very high speed which is highly desirable in this class oipvvork. rllie mechanism described 'for ro tating and vertically reciprocating the carrier are easily timed to give the required movements to carry the grinder over thev 'removal of the requisite' amount of metal.

ri`he Whole machine is so arranged that the parts carried by the rotating carrier are symmetrically balanced with respect to the axis of rotation. The counterbalance l balances'the spindle support and the parts carried by it, the idlers 89, 90, 93 and 94 are counterbalanced by the brushes 84, 85 and their connected parts and if necessary iurther Weight is added in the structure of the motor casing or otherwise to insure this counterbalancing eect. This insures a steady and even rotary and vertical moveincassa ment and reduces the Wear of the carrier in its bearings to the minimum thus in turn insuring extreme accuracy in the grinding operation.

ln order properlyl to center the Work beneath the grinder simple and eiiicient means detachably secured to the carrier are provided and a preferred forni of such means is illustrated in Figs. 5 and 8. The centering device comprises a conical foot 102 and an odset shank 1L03 extending up 'from the foot at one side thereof. rl'his shanlr'is provided With clamping means shown as made up or the Semi-circular arms d rigid with the shank 103 and the semi-circular arms 105 hinged to the arms i04- at l0@ and.

clamped thereto by the set screws i0?. The construction is such that when the device is clamped upon the carrier 17 the vertical anis or theconical 'foot l02 will be in alinement with the axis of the grinder spindle when opening to be groundil The 'Work is then adjusted until it ts snugly against the conical surface and then locked in place on the bed plate. The' centering device is then removediand the spindle support adjusted radially in the carrier to bring the tool into Contact with the Work and the machine is then ready iior operation.

Having *fully described my invention, vvhat l claim asnevv and desire secure by Letters Patent is:

l. A.macliine of the character described comprising a bed, a head above the bed, a carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted in the carrier out of alinement with the axis of the carrier and bodily movable radially upon and with respect to the carrier, means for rotating said carrier and iter moving `said carrierA vertically to carry the tool over the surface of 'the'worln means for giving radial movement to the spindle and tool to feed the tool progremively against the Work and means for rotating said tool spindle with respect to said carrier.

2. A machine of the lcharacter described 'comprising a bed, a head above the bed, a

carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted in the carrier, means for rotating said carrier and moving said carrier vertically to carry the tool over the surface of the Work, a motor mounted on said carrier, and driving connections from said motor to said spindle for rotating the spind le with respect to the carrier.

3. A machine of the character described comprising a bed, a head above the bed, a.,

iis

iso

11. machine oit the character described, comprising. the construction defined in claim 9 together with means governed by the number of rotations of the carrier for progressively feeding the tool spindle support radially with respect to the carrier.

l2. A machine of the character described comprising a bed, a head above the bed, a carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted on the carrier, means for rotating said carrier and moving said carrier .vertically to carry the tool over the surface of the work, an electric motor mounted on said carrier, electric contacts vertically movable with said carrier and held against rotary movement therewith, and brushes on said motor in rotary sliding engagement with said contacts, and driving connections from said motor to said spindle for rotating the tool with respect to the carrier.

13. A machine of the character described comprising a bed, a head above the bed, a carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted on the carrier, means for rotating said carrier and moving said carrier vertically to carry the tool over the surface of the work, an electric motor mounted on said carrier, uprights extending vertically from said head alongside the carrier and adapted to be electrically connected to the terminals'of an electric circuit, electric contacts vertically movable with said carrier, said contacts being insulated from but slidable along and held by said uprights against rotary movement with the' carrier, sliding contacts connecting said contacts respectively with said uprights, lead wire brushes on said motor in rotary slidable engagement with said contacts, and driving connections from said motor to said spindle for rotating the spindle with respect to the carrier.

. 1l. .lnY a machine of the character described a rotarily and vertically movable carrier provided with a carrier base, a spindie support radially movable in said base, a

' tool and a vertical tool spindle carried by said support, anti-friction' bearings between said support andsaid base including a. single row of balls fitting in opposed grooves in said base and support whereby accurate rectilinear movement of the supportl on the base is secured.

1.5. ln a machine .of the character described a rotarily and verticallymovable carrier providedwth a carrier base, a spindle support radially movable in said base. a tool and a vertical tool spindle carried by said support, a counterbalance for the supand partscarried thereby mounted for radial movement on said base, a reversely threaded screw extending through said support and through said counterbalance Whereby when the screw is rotated the support and the counterbalance will be fed in opposite radial directions.

16.' ln a machine ot the character described the construction defined in claim 15 together with pawl and ratfchet mechanism mounted on said base and adjustable driving connections between said pawl and ratchet mechanism and said screw whereby as the pawl is actuated the screw will be turned to produce the quired feeding movement.

17. A machine of the character described comprising a bed, a head above the bed, a carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted in the carrier and bodily movable radially upon and with respect to the carrier, means for rotating said carrier, means for moving said carrier vertically, means for giving the bodily radial movement to the spindle and tool to feed the tool progressively toward the work during the grinding operation and means lor rotating said spindle with respect to said carrier.

18. A machine of the character described comprising a bed, a head above the bed, av

carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted in the carrier, means for rotating said carrier, means for moving'said carrier vertically, a motor mounted on said carrier, and driving connections `trein said motor to said spindle for rotating the tool with respect to the carrier.

19. A machineof the character described comprising a bed, a head above the bed, a carrier rotarily andvertically movable in said head, a tool and a vertical tool spindle rotatably mounted in the carrier, means for rotating said carrier and for moving said carrier vertically to carry the tool over the surface of the work, means for rotating said spindle with respect to said carrier, and adjustable means for progressively feeding the spindle bodily and radially of the carrier.

20. A machine of the character described comprising a bed, a head above the bed, a carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted in said carrier, means for rotating said carrier and for moving said carrier vertically to carry the tool over the surface of the work, means for rotating said spindle with respect to said carrier, and means governed by the number oie rotations of the carrier for progressively feeding the spindle bodily and radially of the carrier.

21. A machine of the character described comprising a bed, a head above the bed, a carrier rotarily and vertically movable in said head, a tool and a vertical tool spindle rotatably mounted in the carrier, means Jfor rotating said carrier and for moving said carrier vertically to carry the tool over the surface of the work, means for rotating said lBO spindle with respect to said carrier, means for progressively feeding the spindle bodily and radially of the carrier, a counterbalance, and means for simultaneously feeding the counterbalanoe in a direction opposite to thatv in which the Spindle is fed whereby the vtool is fed progressively toward t-he Work and the balance of the carrier is maintained.

22. A machine of the character described comprising a bed, a head above the bed, a carrier rotarily and 'vertically movable in said head, a tool and a vertical tool spindle rotatably mounted on the carrier, means for rotating said carrier and 'moving said carrier vertically to carry the tool over the sur-l face of the Work, an electric motor mounted on said lcarrier, driving connections from said motor to said spindle1 for rotating the tool with respect to the carrier, and means for transmitting the electric current to said motor during its bodily vertical and rotary' movements. v

23. A machine of the character described comprising a bed, a head above the bed, a carrier rotarily and vertically movable in the head, a tool and a vertical tool spindle rotatably mounted in the carrier, means for rotating said carrier, means for rotating said spindle with respect to said carrier, a lever mounted in said head and at one end ing the carrier, a counterbalance at the other end of the lever, and 4means engaging the lever and acting to oscilla-te the same. A

25. A machine of the character described' having a rotatable tool spindle, a rotatable carrier for said tool spindle, means for rotating said carrier, means for rotating the tool spindle carried by and reciprocating with the carrier, means for adjusting the said tool spindle out of axial alinement with the axis of rotation of the said carrier, and means for reciprocating the said rotatable carrier and the rotatable spindle carried thereby. y v

In testimony whereof, I have signed my name to this specification. Y

` EDWARD RIVETT. 

